Permutation of letters from a word or number

12345678910
Across
  1. 4. CROSSWORD
  2. 5. COMBINATORICS
  3. 8. GOOGLE
  4. 9. SULTANATE
Down
  1. 1. 44555666677777
  2. 2. MATHEMATICS
  3. 3. ONLINE
  4. 6. AERIES
  5. 7. THANKS
  6. 10. 999555